Added EdDSASecurityProvider that can be registered in the JCE

Author: Lyor Goldstein

pom.xml

@@ -8,6 +8,9 @@
   <packaging>bundle</packaging>
   <description>Implementation of EdDSA in Java</description>
   <url>https://github.com/str4d/ed25519-java</url>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
   <licenses>
     <license>
       <name>CC0 1.0 Universal</name>
@@ -100,6 +103,9 @@
             <goals>
               <goal>jar</goal>
             </goals>
+            <configuration> <!-- There are some malformed javadoc comments -->
+                <failOnError>false</failOnError>
+            </configuration>
           </execution>
         </executions>
       </plugin>

src/net/i2p/crypto/eddsa/EdDSAKey.java

@@ -16,12 +16,16 @@
 /**
  * Common interface for all EdDSA keys.
  * @author str4d
- *
  */
 public interface EdDSAKey {
+    /**
+     * The reported key algorithm for all EdDSA keys
+     */
+    String KEY_ALGORITHM = "EdDSA";
+
     /**
      * return a parameter specification representing the EdDSA domain
      * parameters for the key.
      */
-    public EdDSAParameterSpec getParams();
+    EdDSAParameterSpec getParams();
 }

src/net/i2p/crypto/eddsa/EdDSAPrivateKey.java

@@ -56,10 +56,12 @@ public EdDSAPrivateKey(PKCS8EncodedKeySpec spec) throws InvalidKeySpecException
                                      EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512)));
     }
 
+    @Override
     public String getAlgorithm() {
-        return "EdDSA";
+        return KEY_ALGORITHM;
     }
 
+    @Override
     public String getFormat() {
         return "PKCS#8";
     }
@@ -101,6 +103,7 @@ public String getFormat() {
      *
      *  @return 49 bytes for Ed25519, null for other curves
      */
+    @Override
     public byte[] getEncoded() {
         if (!edDsaSpec.equals(EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512)))
             return null;
@@ -177,6 +180,7 @@ private static byte[] decode(byte[] d) throws InvalidKeySpecException {
         }
     }
 
+    @Override
     public EdDSAParameterSpec getParams() {
         return edDsaSpec;
     }

src/net/i2p/crypto/eddsa/EdDSAPublicKey.java

@@ -51,10 +51,12 @@ public EdDSAPublicKey(X509EncodedKeySpec spec) throws InvalidKeySpecException {
                                     EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512)));
     }
 
+    @Override
     public String getAlgorithm() {
-        return "EdDSA";
+        return KEY_ALGORITHM;
     }
 
+    @Override
     public String getFormat() {
         return "X.509";
     }
@@ -82,6 +84,7 @@ public String getFormat() {
      *
      *  @return 47 bytes for Ed25519, null for other curves
      */
+    @Override
     public byte[] getEncoded() {
         if (!edDsaSpec.equals(EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.CURVE_ED25519_SHA512)))
             return null;
@@ -148,6 +151,7 @@ private static byte[] decode(byte[] d) throws InvalidKeySpecException {
         }
     }
 
+    @Override
     public EdDSAParameterSpec getParams() {
         return edDsaSpec;
     }

src/net/i2p/crypto/eddsa/EdDSASecurityProvider.java

@@ -0,0 +1,37 @@
+package net.i2p.crypto.eddsa;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.security.Provider;
+import java.security.Security;
+
+import net.i2p.crypto.eddsa.spec.EdDSANamedCurveTable;
+
+/**
+ * A security {@link Provider} that can be registered via {@link Security#addProvider(Provider)}
+ *
+ * @author str4d
+ */
+public class EdDSASecurityProvider extends Provider {
+    private static final long serialVersionUID = 1210027906682292307L;
+    public static final String PROVIDER_NAME = "EdDSA";
+
+    public EdDSASecurityProvider() {
+        super(PROVIDER_NAME, 0.1 /* should match POM major.minor version */, "str4d " + PROVIDER_NAME + " security provider wrapper");
+
+        AccessController.doPrivileged(new PrivilegedAction<Object>() {
+            @Override
+            public Object run() {
+                setup();
+                return null;
+            }
+        });
+    }
+
+    protected void setup() {
+        // see https://docs.oracle.com/javase/8/docs/technotes/guides/security/crypto/HowToImplAProvider.html
+        put("KeyPairGenerator." + EdDSAKey.KEY_ALGORITHM, "net.i2p.crypto.eddsa.KeyPairGenerator");
+        put("KeyFactory." + EdDSAKey.KEY_ALGORITHM, "net.i2p.crypto.eddsa.KeyFactory");
+        put("Signature." + EdDSANamedCurveTable.CURVE_ED25519_SHA512, "net.i2p.crypto.eddsa.EdDSAEngine");
+    }
+}